Astronomy:Ymir (moon)

Ymir
	Discovery image of Ymir taken by the La Silla Observatory in August 2000
Discovery
Discovered by	Brett J. Gladman
Discovery site	Observatoire de la Cote d'Azur
Discovery date	2000
Designations
Designation	Saturn XIX
Pronunciation	/ˈiːmɪər/, /ˈɪmɪər/
Named after	Ymir
Alternative names	S/2000 S 1
Adjectives	Ymirian /ɪˈmɪəriən/
Orbital characteristics
Semi-major axis	23,040,000 km
Eccentricity	0.3349
Orbital period	3.6 yr (1315.14 d)
Mean anomaly	244.521°
Inclination	173.125°
Longitude of ascending node	194.086°
\|{{{apsis}}}\|helion}}	22.668°
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	19+50%; −30% km
Rotation period	11.92220±0.00002 h; 11 h 55 m 20 s
Albedo	0.06
Spectral type	D/P

Short description: Moon of Saturn

Ymir /ˈiːmɪər/, or Saturn XIX, is the second-largest retrograde irregular moon of Saturn. It was discovered by Brett J. Gladman, et al. in 2000, and given the temporary designation S/2000 S 1. It was named in August 2003 after Ymir, who in Norse mythology is the ancestor of all the Jotuns or frost giants.^[10]

It takes 3.6 Earth years to complete an orbit around Saturn. Of the moons that take more than 3 Earth years to orbit Saturn, Ymir is the largest, at about 18 kilometres (11 miles) in diameter;^[11] Ymir is also the second largest member of the Norse group, after Phoebe.^[8]

Spectral measurements from Cassini–Huygens show that Ymir is reddish in color, unlike Phoebe's gray color, suggesting a separate origin for this moon.^[8] It shows a similar light curve as Siarnaq and has a triangular shape, rotating in a retrograde direction about once every 11.9 hours.^[8]

Ymir imaged by the CFHT on 23 September 2000

References

↑ Brian G. Marsden (2000-10-25). "IAUC 7512". IAU. http://www.cbat.eps.harvard.edu/iauc/07500/07512.html.
↑ "Ymir". Merriam-Webster Dictionary. https://www.merriam-webster.com/dictionary/Ymir.
↑ Merriam-Webster's Encyclopedia of Literature. 1995.
↑ Budd (1898). "Norse Mythology". St. Mary's Hall lectures: and other papers. p. 84. Because the -r is an inflectional ending, and the oblique stem is Ymi (as in Modern Norse Yme), one might expect the English adjective to be ?Ymian, but that is perhaps too short a word to be easily intelligible.
↑ James Hall III (2015). Moons of the Solar System. p. 107.
↑ Jacobson, R.A. (2007) SAT270, SAT271 (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. http://ssd.jpl.nasa.gov/?sat_elem#saturn.
↑ ^7.0 ^7.1 Denk, T.; Mottola, S. (2019). "Cassini Observations of Saturn's Irregular Moons". 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute. https://www.hou.usra.edu/meetings/lpsc2019/pdf/2654.pdf.
↑ ^8.0 ^8.1 ^8.2 ^8.3 ^8.4 T. Denk, S. Mottola, F. Tosi, W.F. Bottke, D.P. Hamilton (2018). The Irregular Satellites of Saturn. Space Science Series, The University of Arizona Press, Tucson, AZ. Chapter 20. 409–434. doi:10.2458/azu_uapress_9780816537075-ch020. ISBN 9780816537075. Bibcode: 2018eims.book..409D. https://tilmanndenk.de/wp-content/uploads/DenkEtAl2018_IrregularMoons.pdf.
↑ Nicholson, P. D. 2001
↑ Daniel W. E. Green (2003-08-08). "IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". IAU. http://www.cbat.eps.harvard.edu/iauc/08100/08177.html.
↑ Cite error: Invalid <ref> tag; no text was provided for refs named sheppard

External links

MPEC 2000-Y15: S/2000 S 1, S/2000 S 2, S/2000 S 7, S/2000 S 8, S/2000 S 9 (2000 Dec. 19 ephemeris)
Ephemeris IAU-NSES
Saturn's Known Satellites (by Scott S. Sheppard)
Ymir website (by Tilmann Denk)

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Original source: https://en.wikipedia.org/wiki/Ymir (moon). Read more

[discovery-1] Brian G. Marsden (2000-10-25). "IAUC 7512". IAU. http://www.cbat.eps.harvard.edu/iauc/07500/07512.html.

[2] "Ymir". Merriam-Webster Dictionary. https://www.merriam-webster.com/dictionary/Ymir.

[3] Merriam-Webster's Encyclopedia of Literature. 1995.

[4] Budd (1898). "Norse Mythology". St. Mary's Hall lectures: and other papers. p. 84. Because the -r is an inflectional ending, and the oblique stem is Ymi (as in Modern Norse Yme), one might expect the English adjective to be ?Ymian, but that is perhaps too short a word to be easily intelligible.

[5] James Hall III (2015). Moons of the Solar System. p. 107.

[JPL-6] Jacobson, R.A. (2007) SAT270, SAT271 (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. http://ssd.jpl.nasa.gov/?sat_elem#saturn.

[LPSC2654-7] 7.0 ^7.1 Denk, T.; Mottola, S. (2019). "Cassini Observations of Saturn's Irregular Moons". 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute. https://www.hou.usra.edu/meetings/lpsc2019/pdf/2654.pdf.

[DenkEtAl2018-8] 8.0 ^8.1 ^8.2 ^8.3 ^8.4 T. Denk, S. Mottola, F. Tosi, W.F. Bottke, D.P. Hamilton (2018). The Irregular Satellites of Saturn. Space Science Series, The University of Arizona Press, Tucson, AZ. Chapter 20. 409–434. doi:10.2458/azu_uapress_9780816537075-ch020. ISBN 9780816537075. Bibcode: 2018eims.book..409D. https://tilmanndenk.de/wp-content/uploads/DenkEtAl2018_IrregularMoons.pdf.

[9] Nicholson, P. D. 2001

[naming-10] Daniel W. E. Green (2003-08-08). "IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". IAU. http://www.cbat.eps.harvard.edu/iauc/08100/08177.html.

[sheppard-11] Cite error: Invalid <ref> tag; no text was provided for refs named sheppard

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v t e Saturn
Outline of Saturn
Geography	Dragon Storm Great White Spot Hexagon Magnetosphere Rings
Moons	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus S/2004 S 6 S/2004 S 4 S/2004 S 3 Pandora Epimetheus Janus Aegaeon Mimas Methone Anthe Pallene Enceladus Tethys Telesto Calypso Dione Helene Polydeuces Rhea Titan Hyperion Iapetus Kiviuq Ijiraq Phoebe Paaliaq Skathi S/2004 S 37 Albiorix S/2007 S 2 S/2004 S 29 Bebhionn Erriapus Skoll S/2004 S 31 Siarnaq Tarqeq S/2004 S 13 Greip Hyrrokkin Jarnsaxa Tarvos Mundilfari S/2006 S 1 S/2004 S 17 Bergelmir Narvi S/2004 S 20 Suttungr Hati S/2004 S 12 S/2004 S 27 Farbauti Thrymr S/2004 S 30 Aegir S/2007 S 3 Bestla S/2004 S 7 S/2004 S 22 S/2004 S 23 S/2004 S 25 S/2004 S 32 S/2006 S 3 S/2004 S 38 Fenrir S/2004 S 28 Surtur Kari S/2004 S 35 Ymir S/2004 S 21 S/2004 S 24 Loge S/2004 S 36 S/2004 S 39 S/2004 S 33 S/2004 S 34 Fornjot S/2004 S 26
Astronomy	Delta Octantis Saturn-crossing minor planets
Exploration	Cassini–Huygens (Huygens) timeline retirement Pioneer 11 Voyager program Voyager 1 Voyager 2
Related	Fiction Moons The Day the Earth Smiled In Saturn's Rings (2018 documentary)

v t e Natural satellites of the Solar System
Planetary satellites	Terrestrial Martian Jovian Saturnian Uranian Neptunian
Dwarf-planet satellites	Plutonian Haumean Makemakean Eridian OR₁₀ Quaoaran Orcean
Minor-planet moons	Main belt binaries: Antiope Frostia Berna Tokai Ostro Balam Doppler Pauling Iwamoto Wolff Bettig Christophedumas Trojans: Patroclus–Menoetius Hektor–Skamandrios Iphthime Eurydamas TNOs: Huya Typhon–Echidna Lempo–Paha–Hiisi 2002 UX₂₅ Logos–Zoe Ceto–Phorcys Borasisi–Pabu Sila–Nunam Teharonhiawako–Sawiskera Salacia–Actaea 2002 WC₁₉ Altjira Varda–Ilmarë 2003 AZ₈₄ Gǃkúnǁʼhòmdímà–Gǃòʼé ǃHú Mors–Somnus Manwë–Thorondor ǂKá̦gára–ǃHãunu 2013 FY27
Ranked by size	Planetary-mass moon Ganymede largest: 5268 km / 0.413 Earths Titan Callisto Io Moon Europa Triton Titania Rhea Oberon Iapetus Charon Umbriel Ariel Dione Tethys Dysnomia Enceladus Miranda Vanth Proteus Mimas Ilmarë Nereid Hiʻiaka Actaea Hyperion ...
Discovery timeline Inner moons Irregular moons List Planetary-mass moons Naming Subsatellite Regular moons Trojan moons

v t e Moons of Saturn
Listed in approximately increasing distance from Saturn.
Ring shepherds	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus Pandora
Co-orbitals	Epimetheus Janus
G Ring	Aegaeon
Alkyonides	Methone Anthe Pallene
Inner large (with trojans)	Mimas Enceladus Tethys Telesto Calypso Dione Helene Polydeuces
Outer large	Rhea Titan Hyperion Iapetus
Inuit group	Kiviuq Ijiraq Paaliaq S/2004 S 29 S/2004 S 31 Siarnaq Tarqeq
Norse group	Phoebe Skathi S/2004 S 37 S/2007 S 2 Skoll S/2004 S 13(?) Greip Hyrrokkin Jarnsaxa Mundilfari S/2006 S 1 S/2004 S 17(?) Bergelmir Narvi S/2004 S 20 Suttungr Hati S/2004 S 12(?) S/2004 S 27 Farbauti Thrymr S/2004 S 30 Aegir S/2007 S 3(?) Bestla S/2004 S 7(?) S/2004 S 22(?) S/2004 S 23(?) S/2004 S 25(?) S/2004 S 32(?) S/2006 S 3 S/2004 S 38(?) Fenrir S/2004 S 28(?) Surtur Kari S/2004 S 35(?) Ymir S/2004 S 21(?) Loge S/2004 S 36(?) S/2004 S 39(?) S/2004 S 33(?) S/2004 S 34(?) Fornjot S/2004 S 26(?)
Gallic group	Albiorix Bebhionn Erriapus Tarvos
Prograde outer satellites	S/2004 S 24
Rings of Saturn Cassini–Huygens Themis Chiron S/2004 S 6 S/2004 S 4 S/2004 S 3 In fiction

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